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- goog.provide('goog.dom.animationFrame.polyfill');
- goog.define('goog.dom.animationFrame.polyfill.ENABLED', true);
- goog.dom.animationFrame.polyfill.install = function() {
- if (goog.dom.animationFrame.polyfill.ENABLED) {
- var vendors = ['ms', 'moz', 'webkit', 'o'];
- for (var i = 0, v; v = vendors[i] && !goog.global.requestAnimationFrame;
- ++i) {
- goog.global.requestAnimationFrame =
- goog.global[v + 'RequestAnimationFrame'];
- goog.global.cancelAnimationFrame =
- goog.global[v + 'CancelAnimationFrame'] ||
- goog.global[v + 'CancelRequestAnimationFrame'];
- }
- if (!goog.global.requestAnimationFrame) {
- var lastTime = 0;
- goog.global.requestAnimationFrame = function(callback) {
- var currTime = new Date().getTime();
- var timeToCall = Math.max(0, 16 - (currTime - lastTime));
- lastTime = currTime + timeToCall;
- return goog.global.setTimeout(function() {
- callback(currTime + timeToCall);
- }, timeToCall);
- };
- if (!goog.global.cancelAnimationFrame) {
- goog.global.cancelAnimationFrame = function(id) { clearTimeout(id); };
- }
- }
- }
- };
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